<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul {
            margin-top: 50px;
        }
    </style>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in list"> {{item}} </li>

        </ul>
        <button @click="fn">走一走</button>

    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {

                list: ['帅哥', '美女', '程序员']

            },
            methods: {
                fn() {
                    const arr = this.list[0]
                    this.list.splice(0, 1)
                    this.list.push(arr)

                }

            }

        })
    </script>

</body>

</html>